tests: qvm-open-in-vm and qvm-open-in-dvm tests for different file types
tests: qvm-open-in-vm and qvm-open-in-dvm tests for different file types

QubesOS/qubes-issues#1621

woju/qubes-core-admin,QubesOS/qubes-core-admin,QubesOS/qubes-core-admin,woju/qubes-core-admin,marmarek/qubes-core-admin,woju/qubes-core-admin,woju/qubes-core-admin,marmarek/qubes-core-admin,marmarek/qubes-core-admin,QubesOS/qubes-core-admin